Carving and caring

B

beil

Valued Senior Member
Thinking about the flashfloods in Nepal, Arizona now? how were these valleys carved in the first place?
 
beil said:
right! and the heat is turned up, ice turns to water, and the carving accelerates. Take care not to be among the carved.
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Our beautiful Lake District was carved out by glacial movement/erosion last ice age. That's how huge boulders ended up 100 of miles from their original source.
 
geordief said:
Does it need the pebbles,boulders and suchlike embedded in the ice to act like a file on the surface ? Would the ice on its own be too slippy.
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The the U-shaped glaciated valleys around the world are scraped out by the ice, though doubtless entrained rock fragments contribute to the abrasive effect. Don't forget we are talking about weights of thousands of tonnes of ice pushing past the rocks, over millennia. Water also excavates V-shaped valleys and that isn't even solid.
 
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Pinball1970 said:
Our beautiful Lake District was carved out by glacial movement/erosion last ice age. That's how huge boulders ended up 100 of miles from their original source.
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I seem to recall it is an eroded volcanic bloc, centred more or less on the Langdale Pikes. The lakes more or less radiate outward from that area.
 
exchemist said:
The the U-shaped glaciated valleys around the world are scraped out by the ice, though doubtless entrained rock fragments contribute to the abrasive effect. Don't forget we are talking about weights of thousands of tonnes of ice pushing past the rocks, over millennia. Water also excavates V-shaped valleys and that isn't even solid.
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all of it is of course solar powered, because water was lifted to heights by evaporation , some geothermal action is there too. Water is used to cut steel. Lahar, a water and solid mixture has 3 times the weight, many more times the force through it's velocity.
 
The footage is nothing less than brutal. You have a picture in your mind but the reality completely is far worse, simply because we are not used to that kind of image in nature, 2005 and 2011 tsunamis come to mind but this was seconds.

 
The music is nice, no idea what they are saying, a prayer, mourning the dead? I get it in DM goes to A, forlorn. Everyone you see in the image probably did not survive.
 
Pinball1970 said:
The music is nice, no idea what they are saying, a prayer, mourning the dead? I get it in DM goes to A, forlorn. Everyone you see in the image probably did not survive.
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No they probably didn't. Water like that strikes like a sledgehammer. The speed is typical of mountain flooding where the narrow canyons confine the flow like that. I've seen a bit of the reality in western US flash flooding and hearing from relatives who experienced the horrendous Rapid City flood in 1972, where 240 people were killed. Came almost to the house I presently live in, though long before I was there. You can see traces still on some cellar walls, and almost a thousand houses are gone, now that area along Rapid Creek all a memorial park. The corner I live at now has three large storm drains, which I think were one part of the post-deluge response. The city public works is quite diligent about regularly coming with a giant suction device and cleaning out those storm drains. The city may slack off on some things, but everyone is on the same page about flood mitigation since 1972.

When we lived in another Black Hills town, there was a flash flood which sent a roaring river down the adjacent road which poured into our basement. I actually had a little time on that occasion to shove concrete blocks in front of basement windows and somewhat diminish the force against them. Days spent cleaning mud out. And we got off so easy.
 
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